Design Of Zoom Lens For A Digital Camera

Along with the development of zoom optical system in design theory and manufacturing technology, zoom lens has been widely used in many files including the photographic equipment in which the zoom technology is developing rapidly. The fixed focal lens has been replaced by zoom lens gradually for a long time. For the moment, the zoom lens has been one of the most important accessories in film or digital camera. The dominant position of traditional film camera in photography has been threatened foot by foot with the emergence of digital camera. Digital camera becomes the fist choice of the consumers. Thus, according to the new features of the digital camera, it has undoubtedly significance to study the digital special zoom lens to improve the image quality and performance.This paper is based on the information of domestic and overseas literatures. The.main points of the article are outlined as follows:Firstly, it introduces the emergence and development of the zoom lens briefly, and analyzes the research status and development trend of the digital special zoom lens at home and abroad.Secondly, the article introduces the zoom basic concepts and the zoom variety, and discusses the traditional structural characteristics and zoom modes of various types. Through the comparison of different zoom lens between digital camera and traditional film camera, the article discusses a new structural style of digital special zoom lens, and obtains the zoom structure equations and the limiting condition of how to choose the initial structure.Thirdly, this paper also introduces the role of the aspheric lens in optical design, and discusses the positive and negative aspects of using the aspheric lens.Finally, this paper designs and realizes a digital special wide angle zoom lens which has the new structural style mentioned above. According to the comprehensive evaluation of the final optical system, this structure could achieve the requirements of large field zoom lens in the digital camera. All the lenses composing the zoom system are spherical lens, so the production cost could be reduced effectively.